Question

which pair will show common ion effect
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Answer 1

Answer:

Common ion effect is shown when weak electrolyte and strong electrolyte is mixed . Strong electrolyte has the ion which is common in weak electrolyte and thus option is 3 as all other options has strong electrolyte only

Answer 2

Answer:

weak electrolyte and strong electrolyte.

Explanation:

when both are mixed they will show common ion effect